David Pratt wrote at 2005-9-21 13:38 -0300: > ... If I wanted to configure with multiple zodb >for a single ZEO server you say there may be a possible downside in >requiring a single ZEO server per database instance further down the >road. Is this something that is currently planned so I don't implement >something that will not be supported later?
This was discussed on a zope mailing list (I think "firstname.lastname@example.org"). Please search the archives (via your favorite search engine). >It could be also be a bit >of a problem since each ZEO server requires its own RAM. RAM is a >valuable commodity. ZEO is not very RAM hungry. Only for packing, a higher amount of RAM is necessary. >My goal is to ensure that customers I work with are working exclusively >in their own zodb. It seems preferable for these zodb's to be >associated with a single ZEO server (instead of each zodb mounted in a >single zope instance) to make maintenance tasks smooth and handled >asynchronously. Does this not speak for one ZEO server per customer? Imagine, you must restore a storage for one customer (because he destroyed its content). With a single ZEO server, you must bring it down to activate the backup. All your customers are affected. With a separate ZEO for each customer -- you bring down the ZEO for this customer. All others are unaffected. >I realize that if resources were >unlimited, it would be best for a single ZEO server to use a single >zodb and have one or more ZEO clients. Huch? I do not understand that argument. With unlimited resources, each customer had its own computer with its own ZEO and ZEO clients... > ... >I guess I see the possibility of single ZEO for a number of virtual >hosted sites as a plus (since it means also that I could add additional >ZEO clients to provide more threads for serving the group of virtual >sites). But for this, it does not matter whether you have one or many ZEO servers... -- Dieter _______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )